Pixel Electrode Layout for Reliable LED Display Connections
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Solution Overview
Problem
Existing display devices face challenges in reliably connecting light emitting elements between electrodes while minimizing the number of mask processes required in fabrication.
Innovation Solution
A display device pixel structure is designed with a light emitting element positioned between first and second electrodes, featuring a series of insulating patterns and contact electrodes to ensure reliable electrical connection, and a method of fabricating this structure that reduces the number of mask processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple mask processes are used to ensure reliable electrical connection of light emitting elements, then connection reliability is improved, but fabrication complexity increases
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode, second pixel electrode, third pixel electrode) that are spatially separated. This segmentation allows each electrode segment to independently connect to contact electrodes, providing multiple connection paths and improving connection reliability while simplifying the overall fabrication process by reducing the need for multiple mask processes.
Solution Approach 2:
Different regions of the pixel structure are assigned different functions and properties. The first, second, and third pixel electrodes are positioned at different locations and have different connection configurations, allowing local optimization of electrical connection reliability without requiring uniform complex processes across the entire structure.
2Reliability
If multiple mask processes are used to ensure reliable electrical connection, then connection reliability is improved, but manufacturing time increases
Solution Approach 1:
By segmenting the pixel electrode into multiple independent segments, the invention enables parallel processing during fabrication. Multiple connection points can be formed simultaneously in a single mask process, reducing the total manufacturing time compared to sequential mask processes while maintaining high connection reliability through multiple connection paths.
3Reliability
If complex electrode and insulating patterns are used to ensure reliable connection, then connection reliability is improved, but device structure complexity increases
Solution Approach 1:
The pixel electrode is segmented into multiple simpler electrode segments rather than using a single complex continuous electrode. This segmentation reduces structural complexity by breaking down the electrode into manageable parts while improving connection reliability through multiple independent connection paths to contact electrodes.
Solution Approach 2:
Instead of forming a single continuous pixel electrode that requires complex routing and insulation, the invention inverts the approach by using multiple separate pixel electrode segments. This inversion simplifies the overall structure by eliminating the need for complex electrode routing while maintaining reliable electrical connections through multiple contact points.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A display device may include a pixel disposed in a display area. The pixel may include: first and second electrodes; a light emitting element disposed between the first and second electrodes; a first insulating pattern disposed on the light emitting element such that first and second ends of the light emitting element are exposed; a second insulating pattern disposed on the first insulating pattern such that opposite ends of the first insulating pattern are exposed; a third insulating pattern disposed on the second insulating pattern to cover opposite ends of the second insulating pattern; a first contact electrode disposed on the first end of the light emitting element, and electrically connecting the first end to the first electrode; and a second contact electrode disposed on the second end of the light emitting element, and electrically connecting the second end to the second electrode.